Bringing low (some - those who will enter Hell) Exalting (others - those who will enter Paradise). [Tafsir Ibn Kathir]

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When the earth will be shaken with a terrible shake.

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And the mountains will be powdered to dust,

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So that they will become floating dust particles.

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And you (all) will be in three groups.

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So those on the Right Hand (i.e. those who will be given their Records in their right hands) - how (fortunate) will be those on the Right Hand! (As a respect for them, because they will enter Paradise).

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And those on the Left Hand (i.e. those who will be given their Record in their left hands) - how (unfortunate) will be those on the Left Hand! (As a disgrace for them, because they will enter Hell).

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And those foremost [(in Islamic Faith of Monotheism and in performing righteous deeds) in the life of this world on the very first call for to embrace Islam] will be foremost (in Paradise).

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These will be the nearest (to Allah).

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In the Gardens of Delight (Paradise).

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A multitude of those (foremost) will be from the first generations (who embraced Islam).

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And a few of those (foremost) will be from the later generations.

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(They will be) on thrones woven with gold and precious stones.

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Reclining thereon, face to face.

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Immortal boys will go around them (serving),

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With cups, and jugs, and a glass of flowing wine,

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Wherefrom they will get neither any aching of the head, nor any intoxication.